Downy mildew of Cucurbits
brown. On the underside of the leave fluffy growth appears which is first white and later turns grey-brown. This is actually the sporulation of the pathogens [...] around 15 o C and the closer the temperature is to this, the shorter the leaf wetness period that is required. Inside the plant, the pathogens produce [...] formed, structures in which zoospores are produced. However, in downy mildews, sporangia often germinate directly and the germ tubes infect the plants either